| 摘要 |
1,249,213. Rechargeable cells. E. I. DU PONT DE NEMOURS & CO. 26 Feb., 1969 [26 Feb., 1968; 15 Jan., 1969], No. 10280/69. Heading H1B. A secondary cell comprises an anode, a cathode and an alkaline electrolyte containing a complexing agent for the anode metal, i.e. a compound which increases the solubility of ions of the anode metal in the electrolyte by changing its ionic form. The active material of the anode may be Zn, Cd, Au, Ni or Pt, possibly as a coating on graphite or steel, and the cathode may be a porous electrode of amorphous carbon, graphite, Pd, Pt, Ni or Ag or an alloy thereof supplied with oxygen or air or a silver/silver oxide electrode. The cathode may include a hydrophobic material, e.g. P.T.F.E. or a paraffin. The electrolyte may be KOH, NaOH, LiOH, Mg(OH) 2 or Ba(OH) 2 . The complexing agent may be NaCN or KCN. A second complexing agent, e.g. the disodium salt of E .D.T.A., may also be present with or without some of the anode metal cyanide, e.g. Zn(CN) 2 . The cell may also contain an auxiliary graphite electrode for use during recharging of the anode. In a particular embodiment, zinc anode 2 is in contact with metal terminal plate 1, porous cathode 5 is in contact with terminal plate 6, air or oxygen is present in chamber 4, electrolyte 3 ionically connects the electrodes and case 7 is of polythene, polypropylene, polymethyl methacrylate, or a rubber such as neoprene. A number of these cells may be joined in series to form a battery. |
